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Group 28 Troubleshooting
MID 128 PPID 123 EPG 2
D12B and D12C
Fault Codes
FMI 3
Short circuit to voltage.
Conditions for fault code:
•
Output activated.
•
Short circuit to battery voltage on EB36.
Possible cause:
•
Short circuit to battery voltage between solenoid
valve and EECU.
•
Short circuit in solenoid valve.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
EPG1, EPG2 and VCB outputs are switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
The heat retention does not function.
•
Blue smoke under cold conditions.
•
The engine may be difficult to start.
•
Engine brake does not function.
FMI 4
Short circuit to ground.
Conditions for fault code:
•
Output switched off.
•
Short circuit to ground on EB36.
Possible cause:
•
Short circuit to ground between solenoid valve and
EECU.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
Noticeable external symptom:
•
Yellow lamp lights up.
•
EPG 2 constantly activated.
•
Low power output.
•
Black smoke.
FMI 5
Break.
Conditions for fault code:
•
Output switched off.
•
Open circuit in the EPG2 circuit.
Possible cause:
•
Open circuit between solenoid valve and EECU.
•
Open circuit in supply wire to solenoid valve.
•
Blown fuse for supply to EPG2.
•
Open circuit in the solenoid valve.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
EPG1, EPG2 and VCB outputs are switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
The heat retention does not function.
•
Blue smoke under cold conditions.
•
The engine may be difficult to start.
•
Engine brake does not function.
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